With regards to localized corrosion, the role of uniform corrosion of aluminum alloys has not always been accounted for in the past. The impact of uniform corrosion on aluminum alloys 2024-T3, 6061-T6, and 7075-T6 is studied here to provide quantitative evidence of its importance. Preliminary weight loss experiments combined with optical profilometry (OP) indicate that corrosion attributed to uniform corrosion is very significant when compared to localized corrosion. A series of free immersion tests were conducted to understand the influence of environmental variables including temperature (20, 40, 60, 80 °C), initial pH without buffering (3, 5, 8, 10) and chloride concentration (0.01, 0.1, 1 M) for 1, 7, and 30 days. With time, uniform corrosion results exhibited a strong dependence on temperature accompanied by variable pH- and temperature-dependent corrosion product formation. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization were utilized to characterize the oxygen reduction reaction (ORR) and corrosion product formation as a function of temperature. Electron microscopy was conducted to assess the microstructure and morphology of corrosion products and provide supporting evidence for electrochemical findings.
|Number of pages||12|
|State||Published - May 1 2016|
Bibliographical noteFunding Information:
This research is sponsored by the U.S. Air Force Academy under agreement number FA7000-10-2-0012. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon. The views and conclusion contained herein are those of the authors and should not be interpreted as necessarily represented official policies or endorsement, either expressed or implied, of the U.S. Air Force Academy or the U.S. Government.
© 2016 Elsevier Ltd. All rights reserved.
- aluminum alloy
- oxygen reduction reaction
- uniform corrosion
ASJC Scopus subject areas
- Chemical Engineering (all)